Weldrod



' Patented Apr- 30, 1935 15999 888 lm'rao STATES PATENT oFI icE wsmnop Ernst Ammann, .Essen, Germany, assignor to Fried. Krupp Aktiengesellschaft, Essen-on-the- Ruhr, Germany Application August 4, 1932, Serial No. 627,504

In Germany September 19, 1931 '8 Claims. (Cl. 219-8) The invention relates to weldrods. It is accompanying drawing in a fragmentary sec-- known to use in metal-depositing welding 015- tional view. In this drawing n. denotes an iron erations, where high resistance to wear and high tube and b the core which consists of a sintered tenacity of the weld is required, iron-tungsten mass of one of the compositions hereinbefore 5 alloys which advantageously contain about 20 described. a

to 80% tungsten and 0.5 to 6% carbon. In these, What I claim and desizeto secure by Letters welding alloys the iron may be replaced by the Patent is: I remaining metals of the iron group, such as 1. The process of manufacturing weldrods connickel or cobalt, and the tungsten by the resisting in preparing a mixture of at least one car- 10 maining carbide-forming heavy metals, such as bide of a metal of high melting point and of at 10 molybdenum, titanium, uranium, vanadium, least one auxiliary metal of lower'melting point, boron. Very satisfactory results are obtained in filling a tube made from metal of the iron group deposition welding by using an alloy containing with this mixture and sintering the latter within about 62% W0, 4.3% C and 32.7 Fe. This 9.1- said tube.

- loy has a melting point of about 1800 to 1900" 2. In the process as specified in claim 1 giving 15 centigrade and, consequently, is well suited tobe' the mixture a composition such as to obtain in deposited by welding by means of the oxyacetywelding an iron-tungsten alloy containing about 1 lene flame which gives a temperature of about to 80% tungsten, 0.5 to 6% carbon, and the 2000 to 2200 centigrade. On the other hand, an remainder iron.

20 alloy of such high melting point cannot be cast 3. In the process as specified in claim 1 giving 20 into weldrods of the usual length by means of the mixture a composition such as to obtain in the existing technical appliances. welding an iron-tungsten alloy containing about The invention hasfor its object to overcome 62% tungsten, 4.3% carbon, and the remainder this drawback that is to render possible the maniron.

ufacture of weldrods of the above average com- 4. In the process as specified in claim 1 adding 25. position and of the customary length. This obtothe mixture to be sinter'ed-previous-to the sinject is achieved according to the invention by teringupto chromium or chromium carbide,

filling an iron tube with a suitable mixture of 5% silicon, and 10% manganese.

-- tungsten carbide and one or more auxiliary 5. In the process asspecified inclaim 1 adding 30 metals of lower melting point and sintering the to the mixture to be sintered previous to the sin- 30 mixture down at a temperature of more than teringabout 10% chromium orchromium'carbide, 1000 centigrade, so that a solid core is formed. 2 to 3% silicon, and 3 to 5% manganese.

When a weldrod of this structure isused in weld- 6. As a new article of manufacture aweldrod ing by means of the oxyacetylene flame, the iron comprising an envelope of a metal of the iron of the tube melts first and is overheated" by the group .containinga mixture sintered within said 35 flame to such an extent that the tungsten carenvelope of at least one carbide of ametal of high bide which simultaneously is very highly heatmelting point with at least one auxiliary metal of ed'dissolves in the liquefied iron. Furthermore, lower melting point. the sintered core of a weldrod manufactured '7. As a new article of manufacture a weldrod 40 according to the invention possesses good eleccomprising an iron envelope containing a compo- 40 tric conductivity so that the weldrod is'well sition sintered within said envelope which, tosuited also for electric welding. gether with the iron of the envelope, in welding A satisfactory fusion of the core with the iron gives an iron-tungsten alloy containing about 20 of the tube is attained by adding to the core to 80% tungsten, 0.5 to 6% carbon, and the rematerial previous to the" sintering up to 30% mainder iron. a I 45 chromium or chromium carbide, 5% silicon, 8. Asanew article of manufacture a weldrod and 10% manganese, particularly good results comprising an iron envelope containing acompobeing obtained by addition of about 10% of sition sintered within said envelope which, tochromium or chromium carbide, about 2. to 3% gether with the iron ofthe envelope, in welding silicon, and about 3 to 5% manganese. givesaniron-tungnten alloycontaining about 62% 50 A weldrod manufactured according to the in-, tungsten, 4.3% carbon, andthe remainder iron. vention is illustrated by way oi' example in the ERNST AMMANN. 

